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Question

Find the perimeter of the triangle. Round to the hundredth.

Find the perimeter of ABC with vertices A(-4, 3) B(1, -5), and C (-4, -5) Round your answer to the nearest hundredth. The perimeter of ABC is about ___ units.

Answer 1

A(-4,3) B(1,-5) C(-4,-5)

This is right angle triangle. ∠C=90^°

BC = 5units ( 1 to -4 along x-axix)

AC = 8units ( 3 to -5 along y-axix)

AB = √5² + 8² = 9·43 units

Perimeter = AB + BC + AC

P = 9.43 + 5 + 8 = 22·43units.

Answer 2

22.43 = perimeter

Area = 20 altitude =8, base = 5, hypotenuse = sqr(64+25) = sqr89 = about 9.43

9.43 + 5 = 8 = 22.43 = perimeter