Explain why angle d must be a right angle
pls

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Step-by-step explanation:

Using Pythagoras' identity

The square on the hypotenuse of a right triangle is equal to the sum of the squares on the other 2 sides.

Consider the right triangle on the right and calculate n

n² + 2² = 3²

n² + 4 = 9 ( subtract 4 from both sides )

n² = 5 ( take the square root of both sides )

n =

If the triangle on the left is right then the square of the longest side must equal the sum of the squares on the other 2 sides.

The longest side is n = ⇒ n² = ( )² = 5 and

( )² + ( )² = 2 + 3 = 5

Hence D is a right angle

cut 138 centimeters off

step-by-step explanation:

250-112 = 138

$649.60

step-by-step explanation: