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Fynjy0 [20]
3 years ago
10

the perimeter of parallelogram ABCD is 30 cm. AD 3 cm more then twice AB. find the length of AB. a) 3 cm b) 4 cm c) 9 cm d) 11 c

m
Mathematics
2 answers:
Delvig [45]3 years ago
7 0
Its 4 centimeters :

4x2=8+3=11 so AD is 11 and AB is 4 
since its perimeter you need it from each side and parallelograms have congruent opposite sides so 11+11+4+4=30 ;)
daser333 [38]3 years ago
5 0

Answer:

Option B. AB=4\ cm

Step-by-step explanation:

we know that

In a parallelogram opposite sides are congruent and parallel

so

AB=CD

BC=AD

the perimeter of parallelogram is equal to

P=2(AB+AD)

we have

P=30\ cm

so

30=2(AB+AD) -----> 15=(AB+AD) ----> equation A

AD=2AB+3 -----> equation B

Substitute equation B in equation A and solve for AB

15=(AB+2AB+3)

15-3=3AB

3AB=12

AB=4\ cm

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<h3>How to determine the 3-digit number?</h3>

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