Question

Tolongin nmr 76 dong

Answer 1

Luas ABC = 1/2 * Luas ABCD

so,
L. ABC = 1/2 * 672 = 336 cm²
1/2 * AC * BE = 336
1/2 * 42 * BE = 336
21 BE = 336
BE = 336/21
BE = 16

pada segitiga ABE (siku-siku di E), maka berlaku :
AE² = AB² - BE²              (dg AB = CD = 34)
AE² = 34² - 16²
AE² = 900
AE = 30 cm

Dg demikian, CE = AC - AE = 42 - 30 = 12 cm