Area and Perimeter of Triangles

Grade 10·21 problems·~30 min·ACT Math·topic·act-geo-tri-area

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Recall / Warm-Up

A right triangle has legs of length 5 and 12. What is the length of the hypotenuse?

A triangle has sides of length 7, 7, and 10. How is this triangle classified by its sides?

Equilateral

Isosceles

Scalene

Right

What is the perimeter of a triangle with sides 9, 12, and 15?

A right triangle has legs 6 cm and 8 cm. What is the area in square centimeters?

A triangle has a base of 14 in and a perpendicular height of 9 in. What is its area?

126 in²

63 in²

46 in²

23 in²

A right triangle has legs 5 cm and 12 cm. What is the perimeter in centimeters?

What is the area of an equilateral triangle with side length 6?

$9\sqrt{3}$

$18\sqrt{3}$

A triangle has vertices at $(1, 1)$ , $(5, 1)$ , and $(3, 5)$ . What is the area?

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