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Congruent triangles are exactly the same, meaning they have the same side length, and thus same angles. Everything is exactly the same, as easy as it gets :)

So, you can compare the two pictures to get the informations you need:

, since it is a right angle

, as we can see on the right by comparison

. In fact, the angles of a triangle sum to , so we have . So,

yd, as we can see on the left by comparison.

Finally, we can compute using the Pythagorean theorem:

you're missing vital information, add to it so we can solve this problem for you.

step-by-step explanation:

by definition, an arc subtended by a central angle of some given measure has the same measure. so .