Answer 1

Given: (1) ABCD is a rectangle.

(2) AB = 10 cm

(3) AD = 5cm

To find: Area of ΔEGF.

Calculation: We know that,

Area of Rectangle = base × height

If a triangle and a parallelogram are on the same base and between the same parallels, the area of the triangle is equal to half of the parallelogram 

Here we can see that Rectangle ABCD and triangle GEF are between the same base and same parallels.

Hence,

Area of ΔGEF = `1/2` Area of Rectangle ABCD 

                      `= 1/2 xx AD xx CD`

                     `= 1/2 xx 10 xx 5 `

                       = 25 cm²

Hence we get the result as Area of ΔGEF = 25 cm²