X + 70 = 90
x = 90 - 70
x = 20 <== u can add 20 to 70 to get 90
6 semicircles = 3 circles
The formula of the area of a equilateral triangle:

We have a = |AE| = 3cm. Substitute:

The formula of the area of a circle:

We have 2r = |AE| =3cm → r = 1.5cm. Substitute:

The area of the figure:

7 is the leases common I’m pretty sure