Nomor 47&48 ? Pakai cara. Makasih

47.)
besar sudut a =
( 180 - 40 ) / 2 = 140 / 2 = 70derajat

sudut ADE = siku siku = 90derajat

dit = sudut BED ....,?
180 - 90 - 70 = 20derajat ( A )

48.)
PQR = 180 - 98
PQR = 82derajat

p - r = 28
p = 28 + r

180 = p + Q + r
180 = 28 + r + 82 + r
180 = 110 + 2r
2r = 180 - 110
r = 70 / 2
r = 35

p = 28 + r
p = 28 + 35
p = 63 ( C )

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