The height of a cone is 4.2 centimeters, and the volume is 174.5 cubic
centimeters. Which of the following is
the closest to the radius r of the cone, in
centimeters? (8.1B, 8.IC, 8.1F)
A r = 3.6 cm
Br= 2.1 cm
cr= 6.4 cm
D = 6.3 cm

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?