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46.
BD² = BC² + CD²
BD² = 12² + 3,5²
BD² = 144 + 12,25
BD² = 156,25
BD = √156,25
BD = 12,5 cm

keliling ABCDE = 3 (12,5) cm + 12 cm + 3,5 cm
= 37,5 cm + 15,5 cm
= 53 cm

47.
BC² = BD² - CD²
BC² = 5² - 3²
BC² = 25 - 9
BC² = 16
BC = √16
BC = 4 cm

AB² = BD² + AD²
AB² = 5² + 12²
AB² = 25 + 144
AB² = 169
AB = √169
AB = 13 cm

L ABCD = 1/2 (DC + AB) × BC
= 1/2 (3 + 13) × 4 cm²
= 16 × 2 cm²
= 32 cm²