Geometry and TrigonometryEasy–MediumEqual sides of an isosceles triangle from its perimeter
Geometry and Trigonometry practice question
An isosceles triangle has a perimeter of 32 centimetres and a base of 12 centimetres. What is the length, in centimetres, of each of the two equal sides?
Answer: 10
The two equal sides together make 32 − 12 = 20 centimetres, so each is 10.
Common wrong answers
- If you answered 12
- 12 is the base, not an equal side.
- If you answered 20
- 20 is the total of the two equal sides; each is half of that.
- If you answered 6.67
- 6.67 is 20/3, dividing among three sides instead of two.
More Geometry and Trigonometry questions
- Easy–Medium
A circle has a radius of 6. What is its area? (Use A = πr².) - Easy–Medium
A right triangle has legs of length 6 and 8. What is the length of the hypotenuse? - Easy–Medium
A circle has a radius of 5. What is its circumference? (Use C = 2πr.) - Easy–Medium
What is the midpoint of the segment joining the points (2, 3) and (8, 11)? - Easy–Medium
What is the measure, in degrees, of angle B? - Easy–Medium
What is the area, in square centimeters, of the trapezoid?
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