Given: WXZY ,WYZX Prove: ZWZZ
w
Х
Y
Z
O A. Given: WXZY and WY ZX
XYXY : Reflexive Property of Congruence
AW XY AZY X : SSS Postulate
ZW ZZ corresponding parts of congruent triangles
O
B. Given: WXZY and WYZX
ZWYZZYZX
alternate interior angles of parallel sides
ΔW XY ΔZY X X SAS Postulate
ZW LZ
corresponding parts of congruent triangles

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?