Question

Answer question number 9,10,11
If u answer all 3 i will marks as brainliest

Answer 1

Answer:

9)

LET THE TWO EQUAL ANGLES BE X

ONE ANGLE=90°=∠1 (IT'S A RIGHT ANGLED TRIANGLE)

⇒X+X+∠1=180 (ANGLE SUM PROPERTY)

⇒2X=180-90=90

⇒X=90/2=45°

MEASURE OF BOTH THE ANGLES IS 45°

10)LET THE MEASURE OF EACH ANGLE BE X (AS THEY ARE EQUAL)

⇒X+X+X=180 (ANGLE SUM PROPERTY)

3X=180

X=180/3= 60°

MEASURE OF EACH ANGLE IS 60°

11)LET ∠1=90° AND ∠2=40°

WE HAVE TO FIND ∠3

⇒∠1+∠2+∠3=180 (ANGLE SUM PROPERTY)

∠3=180-(90+40)

∠3=180-130

∠3=50°

ALL DONE!!!!! :)

Step-by-step explanation:

Answer 2

Solution

(9)

fir an isosceles right angled triangle one angle is of measure 90° and the other pair of angles produced by the same sides on the same base are equal ..

let ..∆ABC is an isosceles angle in which <C=90°

therefore..the rest of the angles ..i.e.,

<A=<B

now...A+B+C=180°

A+B=180°-C=180°-90°=90°

2A=90°

= A=45°

therefore..B=45° ....as A=B

so the angles are A=B=45°,,and C=90°(ans)

...

(10)

for ∆ABC...A=B=C

therefore..

A+B+C=180°

3A=180°

A=60°. {as,A=B=C}

therefore..

A=B=C=60°(ans)

(11)

for the right angled triangle ∆ABC..let C=90°

now..let..A=40°

therefore..

A+B+C=180°

= 40°+B+90°=180°

=>B=180°-130°=50°

therefore the other angle is 50° (ans)

Hope These helpful for u.....