Question

two angles of a triangle are 70° and 20° , find the third angle and tell what kind of triangle it is .

Answer 1

The third angle is of 90 degree and the triangle is a right angled triangle

Answer 2

THANKS FOR THE QUESTION !

_____________________________

GIVEN :

=> TWO ANGLES OF A TRIANGLE ARE GIVEN :

=> 1ST ANGLE : 70°


=> 2ND ANGLE : 20°

______________________________

TO FIND :

=> 1. THIRD ANGLE

=> 2. TYPE OF THAT TRIANGLE

______________________________

=> THEOREM OF SUM OF MEASURES OF ALL ANGLES OF A TRIANGLE :

=> SUM OF ALL ANGLES OF A TRIANGLE IS 180°

______________________________

1ST ANGLE + 2ND ANGLE + 3RD ANGLE = 180°

=> 70° + 20° + 3RD ANGLE = 180°

=> 90° + 3RD ANGLE = 180°

=> 3RD ANGLE = 180° - 90°

=> 3RD ANGLE = 90°

______________________________

DUE TO ONE ANGLE IS OF 90° ,

=> THIS TRIANGLE IS A RIGHT ANGLED TRIANGLE

______________________________

HOPE IT WILL HELP U.....

THANKS AGAIN......

_______________________________