Area www mathsrevision com N 3 Area Rectangle

Area www. mathsrevision. com N 3 Area Rectangle Area of Triangle Composite Areas Carpet Problem Exam Type Questions 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Starter Questions www. mathsrevision. com N 3 Q 1. What is the time difference 09: 28 and 11: 55 Q 2. Q 3. Convert 23 metres to (a) cm (b) mm Q 4. The answer to the question is 180. What is the question. 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Area of a Rectangle www. mathsrevision. com N 3 Learning Intention Success Criteria 1. We are learning to calculate the area of rectangle. 1. Remember area formula for a rectangle. 2. Apply formula correctly. (showing working) 3. Answer containing appropriate units 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Area of a Rectangle N 3 2. 5 m www. mathsrevision. com Example Find the area of the rectangular bathroom. A=Lx. B A = 5 x 2. 5 A = 12. 5 m 26 -Feb-21 2 Created by Mr. Lafferty Maths Dept. 5 m

A new carpet is to be laid. The cost is £ 20 per m 2 (including fitting) Calculate the total cost of the new carpet. Area of a Rectangle N 3 www. mathsrevision. com Find the area of the rectangular bedroom. A=Lx. B A = 7. 2 x 4 A = 28. 8 m 2 Total cost = 28. 8 x 20 = £ 576 26 -Feb-21 Created by Mr. Lafferty Maths Dept. 4 m 7. 2 m

Area of a Rectangle www. mathsrevision. com N 3 Now try N 4 Lifeskills Ex 1 Ch 15 (page 120) 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Starter Questions www. mathsrevision. com N 3 Q 1. Calculate Q 2. True or false the perimeter of the shape is 130 cm and the area is 46 cm. 13 cm Q 3. Q 4. 26 -Feb-21 10 cm Convert 57 metres to (a) cm (b) mm Created by Mr. Lafferty Maths Dept.

Area of A Right-Angled Triangle www. mathsrevision. com N 3 Learning Intention Success Criteria 1. Develop the formula for the area of any right-angled triangle. 1. Remember the area formula for a right-angled triangle. 2. Use formula to work out area of triangle. 3. Show all working and units. 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Area of A Right-Angled Triangle N 3 www. mathsrevision. com Calculate the area of this shape A=lxb A = 10 x 8 8 cm A = 80 cm 2 10 cm 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Area of A Right-Angled Triangle www. mathsrevision. com N 3 Vertical Height base 26 -Feb-21 Created by Mr. Lafferty Maths Dept. Demo

Area of A Right-Angled Triangle N 3 www. mathsrevision. com Calculate the area of this shape 12 cm 6 cm 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Area of A Right-Angled Triangle N 3 www. mathsrevision. com Calculate the area of this shape 3 cm 4 cm 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Area of A Right-Angled Triangle A shelf costs £ 15. 50. How much for 4 shelves. N 3 www. mathsrevision. com Calculate the area of this right-angle triangular shelf. A = ½bh 40 cm A = ½x 40 40 cm A = 800 cm 2 Total = 15. 50 x 4 = £ 62 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Area of A Right-Angled Triangle www. mathsrevision. com N 3 Now try N 4 Lifeskills Ex 2 Ch 15 Q 4 onwards (page 121) 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Starter Questions www. mathsrevision. com N 3 Q 1. Why is Q 2. What is the time difference 07: 54 and 13: 36 Q 3. Q 4. Convert 45. 1 metres to (a) cm (b) mm Q 5. The answer to the question is 90. What is the question. 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Area of a Composite www. mathsrevision. com N 3 Learning Intention Made up of Simple shapes 1. We are learning to find area for more complicated shapes. Success Criteria 1. Use knowledge gained so far to find the area of more complicated shapes. . 2. Show appropriate working. 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Area of a Composite N 3 www. mathsrevision. com Calculate the area of this shape 9 cm Total Area = 72 + 30 = 102 cm 2 A=lxb 8 cm A=9 x 8 A= 6 cm A=lxb 72 cm 2 5 cm. A =6 x 5 A = 30 cm 2 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Area of a Composite N 3 www. mathsrevision. com Calculate the area of this shape 8 cm 10 cm 6 cm 26 -Feb-21 12 cm

Area of a Composite N 3 www. mathsrevision. com Calculate the area of this shape Total Area = 80 + 24 = 104 cm 2 A=lxb 10 cm A = 8 x 10 A=lxb A = 80 cm 2 A=4 x 6 A =24 cm 2 26 -Feb-21 8 cm 4 cm 6 cm

Area of a Composite N 3 www. mathsrevision. com Calculate the area of this shape Rectangle 1 16 cm A=lxb 5 cm A = 16 x 5 A = 80 cm 2 5 cm 6 cm 26 -Feb-21 Rectangle 2 A=lxb A=6 x 5 A = 30 cm 2 Created by Mr. Lafferty Maths Dept. Total Area = 80 + 30 =110 cm 2

Area of a Composite N 3 www. mathsrevision. com Calculate the area of this shape AT = A 1 + A 2 AT = lxb + ½bh 4 cm 7 cm 8 cm 26 -Feb-21 AT = 8 x 7 + ½(8)(4) AT = 56 + 16 AT = 72 cm 2 Created by Mr. Lafferty Maths Dept.

Area of a Composite www. mathsrevision. com N 3 Now try N 4 Lifeskills Ex 4 Ch 15 (page 126) 26 -Feb-21 Created by Mr. Lafferty Maths Dept.

Scale Drawing Scale 1 cm to 0. 5 m Length 4. 5 m = 9 cm on the scale 5 mdrawing pack Length 6 m = 12 cm on the scalecost drawing £ 4. 50 For carpet grip we need to calculate PERIMETER 4 m Perimeter = 6 + 3 + 2 + 1. 5 + 4. 5 = 21 m (8 cm) 4. 5 m (9 cm) (3 cm) 1. 5 m 2 m (4 cm) No of packs = 21 ÷ 5 = 4. 2 packs So we need 5 packs Cost = 5 x £ 4. 50 = £ 22. 50 (6 cm) 3 m (12 cm) 6 m

Fitting carpet means we need to calculate AREA Minimum Area required = 18 + 6 = 24 m 2 4 m 4. 5 m Area = L x B = 4 x 4. 5 = 18 m 2 6 m 1. 5 m 2 m 6 m 2 Remember the carpet only comes 4 m wide ! 3 m What’s the best way to fit it ?

Minimum AREA required = 18 + 6 = 24 m 2 One possible solution 4 m 1. 5 m 2 m Area 4 x 6. 5 = 26 m 2 4. 5 m 3 m 2 m 6 m Total cost £ 22. 50 + £ 312 = £ 334. 50 Cost £ 12 x 26 = £ 312 With a bit left over !

Minimum AREA required = 18 + 6 = 24 m 2 Best possible solution 4 m 1. 5 m 2 m Area 4 x 6 = 24 m 2 4. 5 m 3 m 6 m Total cost £ 22. 50 + £ 288 = £ 310. 50 Cost £ 12 x 24 = £ 288 Nothing left over !

2 KU

2 KU