Question

Three angles of a quadrilateral are 80°, 110° and 70°. Fund the fourth angle.
Part- B
Which of the following numbers are in Proportion: 5, 9, 10, 18.
epare a Tally Chart​

Answer 1

Answer:

let the forth angle be x

80°+110°+70°+x =360°

260°+x = 360°

x= 360°- 260°

x= 100°

Answer 2

Answer:

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Step-by-step explanation:

$the \: sum \: of \: 3 \: angles \: of \: quadrilateral \\ 80 + 110 + 70 \\ = \: \: 260 \\ \\ sum \: of \: all \: angles \: in \: a \: quadrilateral \: = 360 \\ \\ therefore \: {4}^{th} angle \: = 360 - 260 = 100$