Question

Math: rates

the diagram shows a perimeter of a triangle. given pq : pr = 5 : 4 find the perimeter of the triangle
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Answer 1

99cm

Explanation:

PQ : PR = 5 : 4

PQ = 30cm

5 parts = 30cm

PR is our unknown so let's make that x.

4 parts = x cm

30cm / 5 = xcm / 4

Multiply the numerator of the first fraction with the denominator of the second fraction and the denominator of the first fraction with the numerator of the second fraction and you get your answer for PR, which should be 24cm.

Then, add PQ, PR and QR together and you will get your answer of 99cm.

30cm + 24cm + 45cm = 99cm