math

If the area of a circle is twice the area of a triangle whose base is 4 pi and whose altitude is 4, the radius of the circle equals

a. square root 32
b. 2
c. 4
d. 8
e. 32

1. 👍 0
2. 👎 0
3. 👁 59
1. C) 4

The area of the circle is twice the area of the triangle. Fina the area of the triangle and multiply it by two.

1/2(3.14*4)(4)= 25.12

25.12*2= 50.24

50.24 is the area of the circle so..

50.24/3.14= 16

The square root of 16= 4

1. 👍 0
2. 👎 0

Similar Questions

1. geometry

Theres a circle with an equilateral triangle in the middle. The traingles edges all touch the circle. The radius of the circle is 8 meters. How do I find the area of the triangle? Sorry The triangles edges don't touch the circle,

asked by Emily on April 4, 2007
2. Analytic Geometry

A circle at the origin whose is 2 units is 2 is inscribed in a right triangle whose base is 8 units and altitude 6 units. Find a) The equation of the circle b)The area and circumference of the circle c)The area of the right

asked by Jnr John on August 11, 2014
3. Math- HELP

There is a triangle inside of a circle. I have to find area of the shaded region which is the circle. So i would have to substract the area of the triangle from the area of the circle. the radius of the circle is 3 inches. I found

asked by MK on December 2, 2010
4. math

A triangle has an area of 15 cm^2 and a base of 5 cm. If a circle is drawn with a diameter equal to the length of the triangle's height, what is the area of the circle ? a. 6 pi cm^2 b. 9 pi cm^2 c. 12 pi cm^2 d. 18 pi cm^2 e. 36

asked by Thomas on January 5, 2014
5. maths

radius (r) of a cicrlce is divided into 10 equal sections. The area of the circle = sum of the areas of the pie-shaped sections. We can estimate the area of the circle by thinking of each pie-shaped piece as a triangle with base B

asked by rajkaur on January 4, 2019
6. Math geometry

1) The base angles of an isosceles triangle are (50-x)^6 and (30x-12)^6 what is the vertex angle? 2) The area of a trapezoid is 52cm^2 if it's bases are 8 cm apart find the sum of their heights 3) What is the area of a circle

asked by K on February 27, 2017
7. Algebra

How do you find the area of a shaded area in a triangle and assume the area of the largest triangle is one unit? If the largest (outer) triangle has area =1, and it has a base length b and height h, then (1/2) b h = 1 bh = 2 Then

asked by Candace on September 17, 2006
8. math

If the area of a circle is twice the area of a triangle whose base is 4 pi and whose altitude is 4, the radius of the circle equals a. square root 32 b. 2 c. 4 d. 8 e. 32 please answer and explain

asked by thomas on April 27, 2014