lily3934

01.05.2021 • 

Mathematics

Which of the following is a biconditional statement? Question 4 options:

A)

A shape has four sides if and only if it's a quadrilateral.

B)

If a shape has four sides, then it's a quadrilateral.

C)

If a shape is a quadrilateral, then it has four sides.

D)

If a shape doesn't have four sides, then it isn't a quadrilateral.

Ответ:

felipa11

04.01.2021

Mathematics

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Mes ∠ O = mes (arc PQR/2)
mes ∠ Q = mes (arc POR/2)
arc PQR + arc POR = 360°
arc PQR/2 + arc POR/2 = 180°
THEN:
mes ∠ O + mes ∠ Q =  mes(arc PQR/2) + mes(arc POR/2) = 180°

∠ O + ∠ Q = 180° are supplementary

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