Question

The perimeter of PQR, an isosceles triangle is 17 cm. Given that PQ = QR and QR measures
1 cm less than PR. Find the length of PR in
cm.

Answer 1

Solution

let...

PQ=QR=X cm

now..

PR=X-1

therefore according to the question..

perimeter of the triangle is 17cm..

$x + x + (x - 1) = 17 \\ \\ = > 3x = 18 \\ = > x = 6$

therefore....PR=6-1=5cm

Hope this helps you..

Answer 2

Answer:

PR = 6.3cm

Step-by-step explanation:

PQ = QR = x

PR = x + 1

--> x + x + x + 1 = 17

--> 3x + 1 = 17

--> 3x = 17 - 1 = 16

--> x = 16 / 3 = 5.3cm

--> PR = 5.3 + 1 = 6.3cm