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Big Ideas Math: Modeling Real Life, Grade 8 View details

Chapter Review

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Exercise 9 Page 417

Use the Pythagorean Theorem.

0.4 cm

Practice makes perfect

We will use the Pythagorean Theorem to find the missing length of the triangle. a^2+b^2=c^2

In the formula, a and b are the legs and c is the hypotenuse of a right triangle. We have a triangle with one leg that measures 0.3 centimeters and a hypotenuse that is 0.5 centimeters.

Let's substitute these values into the formula. Remember that a side length is always non-negative, so we only need to consider the positive square root.

a^2+b^2=c^2

SubstituteII

a= 0.3, c= 0.5

0.3^2+b= 0.5^2

▼

Solve for b

CalcPow

Calculate power

0.09+b^2=0.25

SubEqn

LHS-0.09=RHS-0.09

b^2=0.16