Question

Pls answer this question
I know 2 but not the others
Pls answer very important

Answer 1

Answer:

20 cm sq.

Step-by-step explanation:

3rd one :

Length of rectangle = 10 cm

Breadth of rectangle = 4 cm

therefore, Area of rectangle = L x B = 10 x 4 = 40 cm sq.

Base of triangle = 10 cm

Height of triangle = 4cm

therefore, Area of triangle = 1/2 x B x H = 1/2 x 10 x 4 = 20 cm sq.

therefore , Area of shaded region = 40 - 20

                                                         = 20 cm sq.(Ans)

Answer 2

Answer:

Area of rectangle = length × breadth

= 10 × 4

= 40 cm

Area of triangle = 1/2×base × height

= 1/2 × 10 × 4

= 20 cm

Area of shaded region = 40 cm - 20 cm

= 20 cm ans ...

Area of rectangle = 7×6

= 42 cm

Area of inner triangle = 3×4

= 12 cm

Area of shaded region = 42 - 12

= 30 cm ans ...