26022021 WALT Area of a Triangle Calculate the

26/02/2021 WALT: Area of a Triangle Calculate the area of a triangle. Level 6 WILF: Is the answer to: Work out the area of this triangle. Is the answer to: Find the area. Keywords Level 5 Area Triangle Base Is the answer to: Work out the area of the shaded rhombus. Level 7 Level 6 Perpendicular Right angle

Maths Links 8 B: Ex 2 d: Page 25 Power. Points: Lesson TES Worksheets: Area of triangle TES Area of triangles TES Games: Bingo TES Group Work: NRICH: Isosceles triangles

26/02/2021 Starter: Area of a Triangle Find the area of these shapes 24 cm 25 cm 2 5 cm 6 cm 1 cm 5 cm 7 cm 2 7 cm 6 cm 30 cm 2 7 cm 2 cm

26/02/2021 Area of a Triangle Definitions: Area: the amount of space inside a 2 D shape (cm 2/m 2)

26/02/2021 Area of a Triangle Investigation: What is the area of this rectangle? 4 cm 6 cm

26/02/2021 Area of a Triangle Investigation: Now we are going to cut this shape in half to create two right angle triangles 4 cm 6 cm

26/02/2021 Area of a Triangle Investigation: Are these right angle triangles equal?

Area of a Triangle Investigation: What do you think the area of this triangle is then? It is half the area of the rectangle: ½x(4 x 6) 4 cm = 12 cm 2 6 cm 26/02/2021

26/02/2021 Formula: Area of a Triangle The formula for the area of a triangle is: Height (h) Base (b)

26/02/2021 Example: Area of a Triangle Find the area of this triangle: 5 cm 4 cm 6 cm

Activity: 1 Find the area of the following triangles a 3 cm b 4 cm 5 mm 7 mm 4. 5 cm Find the heights of these triangles a a 6 mm b 12 cm 2 15 mm 2 8 cm Find the area of: 2 cm 4 cm 8 cm 3 cm 10 cm c b c 3 m d d 10. 5 m 2 32 cm 2 7 m Problem Solving 3 d 4 m 6 cm 2 c 5 m A triangle has an area of 54 cm 2. The length of the base is 2 x and the height is 3 x. Find the value of x. An equilateral triangle has side lengths of 6 cm. A square has the same perimeter as the equilateral triangle. Find the area of the square. 10 cm 3 x 2 x 6 cm

26/02/2021 Summary: Area of a Triangle Find the area of this star. Find the perimeter of the star.

26/02/2021 WALT: Area of a Triangle Calculate the area of a triangle. Level 6 WILF: Is the answer to: Work out the area of this triangle. Is the answer to: Find the perimeter and area of this rectangle. Keywords Level 5 Area Triangle Base Is the answer to: Work out the area of the shaded rhombus. Level 7 Level 6 Perpendicular Right angle

Area Homework: Image you have 40 metres of fencing. Hints and Tips: What is the largest rectangular area of land you could fence off? Now imagine you could build your fence against a wall, so you only need to use the fence for three sides of the enclosure: What is the largest rectangular area of land you could fence off now? Create a table to show all the different lengths and widths you have used (Level 5) Use algebra to represent the problem (Level 6) Use a graph to help you find the largest area (Level 6 -7)

Area Homework: Image you have 40 metres of fencing. Hints and Tips: What is the largest rectangular area of land you could fence off? Now imagine you could build your fence against a wall, so you only need to use the fence for three sides of the enclosure: What is the largest rectangular area of land you could fence off now? Create a table to show all the different lengths and widths you have used (Level 5) Use algebra to represent the problem (Level 6) Use a graph to help you find the largest area (Level 6 -7)