A builder was given a design plan for a triangular roof as shown. Explain how he knows that △AED ∼ △ACB. Then find AB.

angle AED is congruent to angle ECB and angle ADE is congruent to angle DBC.

Triangle AED is congruent to triangle ACB

AB =  28 feet

Step-by-step explanation:

6/AB = 9/42

42(6) = 9AB

252=9AB

AB=28

.mp4 files, because, video

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.