ABCD is a rectangle. The perimeter is 140 ft. AB = 40ft Find the length of AC

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.