1.

In an equilateral triangle PQR=, if QR= is extended to S, find the value of ∠PRS ??

Answer»

Step-by-step explanation:

Given ;

∆ PQR is an equilateral TRIANGLE.

S is the EXTERNAL point .

FIND ; Value of < PRS .

Solution:

As , it's a equilateral triangle so all the angels are 60° .

( as , in an equilateral triangle all ANGLES are 60° )

Now , we know that ;

External angel = ( SUM of opposite interior angles)

=> < PRS = <RPQ + < PQR

=> < PRS = 60+60

=> < PRS = 120° .( ans )..

Hope ! it's helpful....


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