Help with math please:)

63 un²

Step-by-step explanation

Formula for Triangle = 1/2(b*h)

Lets input our numbers

b(base) = 21

h(height) = 6

Lets multiply

1/2(6 x 21) =

1/2(126) = 63

Now add the units

63 un²

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

the correct answer is semicircle

step-by-step explanation:

the answer is semicircle because the shorter arc joining two points on the circumference of a circle is known as the minor arc, the larger arc is called the major arc, and a semicircle is a half circle, formed by cutting a whole circle along a diameter line.

hope i .