Sally is calculating the perimeters of a number of rectangles, such as the one shown here. she uses the formula p = 2l + 2w. her younger brother joe comes by and suggests simplifying the formula to p = 4w. sally corrects joe's algebra, but he tries his formula on a rectangle and gets the correct answer! (she checks his work.) what can sally conclude from this?

For the equations below which statement is true ?

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem