Which of the following statements about trapezoids is true?
a. both pairs of opposite sides are parallel.
b. one pair of opposite sides is parallel.
c. opposite angles are equal.
d. opposite sides are equal.

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm

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answer: d.) the total number of protons and neutrons is 15

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