You have a cone with a radius of 4ft and a height of 10ft . find the area of the triangle formed by a perpendicular cross-section through the cone's center

Area of a triangle = (b·h)/2
the base would be the diameter of the circle, so 4+4=8 ft, the height is 10 ft.
A= (4×10)/2
A=20 ft²

first anwser choice.

step-by-step explanation:

the greater/less or equal to symbol (> or < with the line at the bottom) is a closed/filled in circle.

when multiplying or dividing by a negative on both sides you have to flip the inequality sign. this rule only applies to multiplying or dividing by a negative number in inequality equations. this rule is really important.

-5c + 2 _< _27

subtract from both sides by 2

-5c _< _ 27

divide both sides by -5

c _< _ 5.4

flip the inequality sign

c _> _5.4

the only possible answer that would match the simplified inequality is the first answer choice

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