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Answer 1

Answer:

Step-by-step explanation:

so if they are a right angled triangles,,,then they must satisfy this : square of the longest side = sum of the square of the two other sides

..in (1) 15^2 = 9^2 + 12^2

=225 = 81 + 144

=> 225 is equal to 225

and hence (i) is a right angled triangle

in (ii) 25^2= 20^2 + 15^2

= 625=400 + 225

> 625=625

and hence (ii) is a right angled triangle

in (iii) 26^2 = 22^2 +10^2

(pro tip : u can divide them by 2 ..to simplify it)

( hence , 26 becomes 13, 22 becomes 11 and 10 becomes 5)

13^2 = 11^2 + 5^2

= 169= 121 +25

169 is not equal to 146..

and hence (iii) is not  right angled triangle

in (iv) simirarily,

13^2=169

12.6^2= 158.76

3.2^2= 10.24

169=169

and hence (iv) is a right angled triangle

Hope it helps :D

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