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Friday, 14 August 2026
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Mathematics Past Questions and Answers

Topic: Plane geometric shapes

Jamb Mathematics Questions - Plane geometric shapes

Question 16:
The sides of a triangle are(x + 4)cm, xcm and (x - 4)cm, respectively If the cosine of the largest angle is \(\frac{1}{5}\), find the value of x
  • A 24cm
  • B 20cm
  • C 28cm
  • D 7cm
  • E \(\frac{88}{7}\)
View Answer & Explanation
Question 17:
PRSQ is a trapezium of area 14cm2 in which PQ||RS. If PQ = 4cm and SR = 3cm, Find the area of SQR in cm2
  • A 7.0
  • B 6.0
  • C 5.2
  • D 5.0
View Answer & Explanation
Question 18:
A regular polygon of n sides has 160o as the size of each interior angle. Find n
  • A 18
  • B 16
  • C 14
  • D 12
View Answer & Explanation
Question 19:
If the length of a square is increased by 20% while while its width is decreased by 20% to form a rectangle, what is the ratio of the area of the rectangle to the area of the square?
  • A 6 : 5
  • B 25 : 24
  • C 5 : 6
  • D 24 : 25
View Answer & Explanation
Question 20:
In the diagram above, QR // TS, QR : TS = 2.3, Find the ratio of the area of triangle PQR to the area of the trapezium QRST.
  • A 4:9
  • B 4:5
  • C 1:3
  • D 2:3
View Answer & Explanation