Determine if the biconditional is true. If false, give a counterexample. "A figure is a square if and only if it is a rectangle."

A. The biconditional is true.

B. The biconditional is false. A rectangle does not necessarily have four congruent sides.

C. The biconditional is false. All squares are parallelograms with four 90° angles.

D. The biconditional is false. A rectangle does not necessarily have four 90° angles.

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.

so a parallelogram is just like a square base times height. multiply 40 and 39 to get 1560 inches.

a triangle is base times height divided by two. so multiply 7.9 and 5 and then divide it by 2 to get 19.75inches.

the kite can be split into two separate triangles and added together to get the total area. 30 x 4 /2 which equals 60. make sure to double it for the two triangles making 120.

r and t.

both are 64 degrees.

answer: do we write it

step-by-step explanation: