A triangle has sides with lengths of 5 meters, 9 meters, and 13 meters. Is it a right triangle?

No.

Step-by-step explanation:

It is a right triangle if it satisfies the Pythagorean theorem.

The theorem states that:

We have:

Therefore:

And we can see that

Therefore it is not a right triangle.

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet