Write 81 as a product of primes.
Use index notation when giving your answer

Trapezoid abcd is an isosceles trapezoid, ad||cb, a diagonal line runs from angle d to b. angle cdb is 50 degrees and angle dab is 70 degrees, find the remaining angle degrees for angles bda, dba, bcd, and dcb.

To prove "p is equal to q" using an indirect proof, what would your starting assumption be?

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