Question

which statement justifies why angle EBC measures 90?

Answer 1

Answer:

The sum of the measures of two complementary angles is 90 degrees

Step-by-step explanation:

we know that

If two angles are complementary, then their sum is equal to 90 degrees

In this problem we have that

m∠ABD and m∠DBC are complementary

so

m∠ABD + m∠DBC=90° -----> by complementary angles

and

(m∠ABD + m∠DBC)+m∠EBC=180° -----> by a linear pair

Find the measure of angle EBC

substitute the given values

(90°)+m∠EBC=180°

∠EBC=180°-90°=90°

Answer 2

Answer:

Statements B and A

Step-by-step explanation:

GIven are some statements and we have to identify the one which justifies the measure of angle EBC as 90 degrees.

We have to use two statements here for the complete proof

B) SInce given that  angles ABD and DBC are complementary we have sum of these angles = angle ABC = 90 degrees

A)since linear pair form supplementary angles and since one pair ABC =90 other pair EBC has to be 90 degrees.