Urgent geometry AD is a diameter of E and BE is perpendicular to AD. If m CD = 30°, what is mBEC?

30°
150°
90°
60°

Which of the following combinations cannot be the side lengths of a triangle?

2.3 inches, 3.4 inches, and 3.2 inches
4.8 inches, 5 inches, and 1.2 inches
2.5 inches, 2.5 inches, and 2.5 inches
6.7 inches, 1.1 inches, and 7.9 inches

AD and BE is perpendicular => angle BED = 90 deg.

Otherwise angle CED = arc CD = 30 deg

=> angle BEC = angle BED - angle CED = 90 - 30 = 60 deg

Suppose a, b and c are 3 sides of a triangle in which a < b < c.

As property of length of sides a, b, and c of a triangle:

c - b < a < c + b

b - a < c < b + a

c - a < b < c + a

=> 6.7 inches, 1.1 inches, and 7.9 inches are not sides of a triangle

Check:

7.9 - 1.1 < 6.7 <=> 6.8 < 6.7  <=> invalid!

Hope this helps!

:)

126.66 m²

step-by-step explanation:

the pertinent area formula is a = πr², where r is the radius.

here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²

10.416 meters per second

step-by-step explanation:

distance=1 00 meters

time= 9.6 seconds in decimal form or 9 3/5 as a mixed number

average speed= 100/9.6

=10.416 meters per second or 10 52/125 as a mixed number.