Finding Missing Sides in Right Triangles

Right Triangle Trigonometry:

Find a missing triangle side

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Multiple Choice

If I know the side lengths of two sides in a right triangle, I can find the length of the third side.

• True

• False

You can use Pythagorean Theorem to calculate the missing side!

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Fill in the Blanks

Fill in the Blanks

Multiple Choice

If I know the side lengths of only one side in a right triangle, but I do know one of the acute angles, I can find the length of the two missing sides.

• True

• False

Multiple Select

Looking at reference angle B, which two sides are marked in the diagram?

• opposite

• adjacent

• hypotenuse

• 70

Multiple Select

Looking at reference angle B, which two sides do "b" and "8" represent?

• opposite

• adjacent

• hypotenuse

• 25

Multiple Choice

Let's focus on these two:

Opposite = b

Adjacent = 8

Which trig ratio uses these two sides?

• sine

• cosine

• tangent

• cotangent

Multiple Choice

Yes, it is the tangent!

Which ratio shows the relationship in the diagram?

• tan(25) = b/8

• tan(25) = 8/b

• tan(8) = b/25

• tan(b) = 8/25

Multiple Select

Looking at reference angle B, which two sides do "c" and "8" represent?

• opposite

• adjacent

• hypotenuse

• 25