How to find area of a triangle within a rectangle?
One of the triangles has the area half the area of the rectangle. First of all, draw a rectangle with three triangles inside. Secondly, observe the triangle in the middle. The middle triangle has the height equal to the width of the rectangle and base equal to the length of the rectangle. i.e. base of triangle (b) = Length of rectangle (L) Also, height of triangle (h) = Width of rectangle (W) Now, Area of middle triangle = .5 x b x h = .5 x (L x W) = .5 x (Area of rectangle) = .5 x 140 = 70 cm2 Area of given triangle = 20cm2 Area of remaining triangle = (140 – 70 – 20) cm2 = 50 cm2 So, the area of the triangles will be 70 cm2, 20 cm2 and 50 cm2.
