Perimeter To find the perimeter of a shape

Perimeter To find the perimeter of a shape we add together the length of all the sides. Starting point What is the perimeter of this shape? 3 2 3 1 Perimeter = 3 + 2 + 1 + 2 = 12 cm 1 2 1 cm

Put these shapes in order

Perimeter of Shapes 1) 2) 9 cm 7 mm 4 cm 4) 3 cm 9 m 12 cm 3 cm 6 m 6) 4 m 5 m 9 m 2 cm 2 m 5 mm 5) 8 cm 7) 3) 6 m 5 m

Answers: 1) 26 cm 2) 24 cm 3) 16 cm 4) 22 cm 5) 36 cm 6) 22 cm 7) 34 cm

Area The area of a shape is a measure of how much surface the shape takes up. For example, which of these rugs covers a larger surface? rug A rug C rug B

Area of a rectangle 2 cm 3 cm Area of rectangle = Length × Width =2× 3 = 6 cm²

Area questions 5 cm A 1 cm 6 cm B 3 cm 2 cm C 7 cm 8 cm D 3 cm E 9 cm 6 m 2 cm F 19 m 20 m G 3 m

Let’s mark! - Answers • • A) Area = 15 cm 2 Perimeter = 16 cm B) Area = 12 cm 2 Perimeter = 16 cm C) Area = 7 cm 2 Perimeter = 16 cm D) Area = 24 cm 2 Perimeter = 22 cm E) Area = 18 cm 2 Perimeter = 22 cm F) Area = 120 cm 2 Perimeter = 52 cm G) Area = 57 cm 2 Perimeter = 44 cm

Area of a right-angled triangle What proportion of this rectangle has been shaded? 4 cm 8 cm What is the shape of the shaded part? What is the area of this right-angled triangle? 1 Area of the triangle = × 8 × 4 = 4 × 4 = 16 cm 2 2

Area of a triangle B. A. 12 cm 10 cm 8 cm C. 12 cm D. 9 cm 7 cm 8 cm 6 cm F. 10 m H. G. 7 m 11 m 7 m 6 m 9 m

Unusual shapes Find the area and perimeter of these shapes 6 cm 2 cm 8 cm 4 cm 3 cm 5 cm A 8 cm B C 5 cm 4 cm 2 cm 6 cm D 3 cm 5 cm 3 cm 10 cm E 2 cm 10 cm