The sides of a equilateral triangle measure 12cm. what is the perimeter of the triangle?

Hi.

In an equilateral triangle, as the name implies, all the sides are equal in length.

You find perimeter by adding all the sides.

The formula for perimeter is 3a where a = the length of the side.

3(12) = 36 cm

The perimeter of the triangle is 36 cm.

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In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct