Question

In triangle PQR , if PQ = QR and ∠ Q = 100o
, then ∠R is equal to

Answer 1

Answer ⬇️

Given, In ∆PQR, PQ = QR so it is a isosceles triangle.

Then, ∠P = ∠R

So, let us assume two angles be x

x + x + 100o = 180o

2x = 180o – 100o

2x = 80o

X = 80o/2

X = 40o

Therefore, x = ∠P = ∠R = 40o

Answer 2

Step-by-step explanation:

In triangle PQR,

PR=QR

Therefore it is an isosceles triangle.

<P = <R

now <P + <Q + <R = 180°

<P + <Q + <P = 180°

2<P + <Q = 180°

2<P = 180 -100

2<P = 80

<P = 40° = <R