ACT Math : How to find the area of an acute / obtuse triangle

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #1 : How To Find The Area Of An Acute / Obtuse Triangle

The base of a triangle is  and the area is .  The height of the triangle is then decreased by . What is the final area of the triangle? 

Possible Answers:

Correct answer:

Explanation:

The formula for the area of a triangle is

  .

If the area is equal to 48 cm2 and the base is 8 cm, then the initial height is: 

If 12 is decreased by 75% then

, and . The final height is 3 cm.

Therefore the final area is

.

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