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phytagoras

b = squareroot (29^2 - 21^2)
b = squareroot (841-441)
b = squareroot 400
b = 20

Measurement of side 'b' in a right angled triangle is equals to 20 units.

What is right angles triangle?

" Right angle triangle is an enclosed 2dimensional figure with three sides and three vertices and measurement of one of the angle is equals to 90°."

Formula used

Pythagoras theorem

(Hypotenuse)² =(adjacent side)² + ( opposite side)²

(a² - b²) = (a - b)(a + b)

According to the question,

In ΔABC , ∠C =90°  

c² = a² + b²

c = 29 , a= 21

Substitute the value of a, b and c in the formula we get

(29)² = (21)² + b²

⇒ b² = (29)² - (21)²

⇒ b² = (29 -21)(29 +21)

⇒ b² = (8)(50)

⇒ b² =400

b =20

Hence, Measurement of side 'b' in a right angled triangle is equals to 20 units.

Learn more about right angled triangle here

https://brainly.com/question/3770177

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