Find the area of a semi circle with diameter d cm

Step-by-step explanation:

Semicircle is HALF of a circle. The area of a circle is given by:

So, area of semi circle is:

Where r is the radius (half of diameter).

The diameter is given as "d", so the radius is half of that, this would be:

Now, substituting this into "r", we get the expression for area of the semicircle:

Area =

This is the area.

b. 24 mm

step-by-step explanation:

use the pythagorean theorem.

a^2 + b^2 = c^2

a^2 + 7^2 = 25^2

a^2 + 49 = 625

a^2 = 576

a = 24

answer: b. 24 mm

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation: