The equilateral triangle shown is rotated about line a. each side of the triangle measures 20 mm. what shape is created by the rotation and what is the approximate circumference of the base? circumference of a circle: c = 2πr

Measure of each side of equilateral triangle = 20 mm

When , we rotate the triangle about line a,which passes through mid point of any of three sides of equilateral triangle

We get the Shape of a Cone.

Distance from line a ,where it cuts one of sides of equilateral triangle to one of vertex of triangle= Radius of circle = 10 mm

→Circumference of a circle= 2 π r

                  = 2 × 3.14 × 10

                   =6.28 × 10

                    = 62.8 mm

                    = 63 mm (Approximately)

b

step-by-step explanation:

the total is 23.97. 0.25% is off so you have to subtracting 25% from 100% and you will get 75% if you convert it to decimal you will get 0.75. you have to find the original because the formula is % times original = total.so you have the total and the % so you just have to plug it in.

0.85 or 85%

step-by-step explanation:

1) divide 23 by 27

2) round the decimal to the nearest 10

3) so your answer would be 0.85 or 85%