X^2 - 8x-9=0
D = b^2- 4*a*c = 64- 4* (-9) = 64+36=100 =10^2
X1 = (8-10)/2 = -1
X2= (8+10)/2= 9
A cone that is sliced through the vertex would make the shape of a triangle.
You are told the h eight is 10 cm and the radius is 4 cm.
The radius would be half the base, so the base would be 4 * 2 =8 cm.
The area of the triangle is found by multiplying the base by the height, then dividing by two.
Area = 8 x 10 = 80
80 / 2 = 40 square centimeters.
Answer:
H
Step-by-step explanation:
The parallel line BC divides the sides AD and AE in proportion, that is
= 
, that is
= 
( cross- multiply )
3AC = 8 ( divide both sides by 3 )
AC = 
= 2 , hence
AE = AC + CE
= 2 + 4 = 6 → H
Answer: 225
Step-by-step explanation:
225x0.04 is 9
