Astack of 60 identical books at the book store was 135 inches tall.

how thick was each book?

a.
2.25 inches

b.
6.75 inches

c.
7.5 inches

d.
22.5 inches
i need instantly

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2