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In a triangle PQR if ∠QPR …

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In a triangle PQR if ∠QPR = 80° and PQ = PR, then ∠R and ∠Q are (a) 80°, 70° (b) 80°, 80° (c) 70°, 80° (d) 50°, 50°

Posted by Neshok Ls 5 years ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years ago

(d) 50°, 50°

Given, QPR is 80 degrees
and PQ=PR
let the other two angles be x,x because it is an isosceles triangle
by triangle sum property
80+x+x=180
2x+80=180
2x=100
x=50
therefore angle R and angle Q are 50 degrees

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