Question

Please tell the answer of this question​

Answer 1

Step-by-step explanation:

From the given figure:-

∆DEF is a right angled triangle

ED=x units

EF=17 units

DF=8 units

By Pythagoras Theorem,

In a right angled triangle the square of the hypotenuse is equal to the sum of the squares of the other two sides.

EF²=DE²+DF²

=>17²=x²+8²

=>289=x²+64

=>289-64=x²

=>225=x²

=>x²=225

=>x=√225

=>x=15 units

DE=x=15 units

Answer 2

Answer:

x=15cm

Step-by-step explanation:

the triangle is right triangle right angled at D

by Pythagoras theorem

(DF)^2+(X)^2=(17)^2

(8)^2+(X)^2=(17)^2

64+X^2=289

X^2=289-64

X^2=225

X=√225

X=15cm

hope it may help you