In the diagram, ST//PQ reflex angle SRQ = 198o and In the diagram, ST//PQ reflex angle SRQ = 198o and o. Find the value of y A. 18o B. 54o C. 87o D. 92o Correct Answer: Option B Explanation R +198 = 360(angles at a point) R = 360 – 198 = 162o C = 72(alternate angle), b + c = 180(angles or straight line) b = 190 – c = 180 – 72 = 108 a + b = R = 162 a = R – b = 162 – 108 = 54, but a = y(alternate angles) y = 54o `, props: [‘comment’], data() { return {} }, methods: {} }) {{ reply.posted_by.display_name }}:   {{ reply.created_at }}

In the diagram, ST//PQ reflex angle SRQ = 198o and o. Find the value of y
  • A.
    18o
  • B.
    54o
  • C.
    87o
  • D.
    92o
Correct Answer: Option B
Explanation

R +198 = 360(angles at a point)
R = 360 – 198 = 162o
C = 72(alternate angle), b + c = 180(angles or straight line)
b = 190 – c = 180 – 72 = 108
a + b = R = 162
a = R – b = 162 – 108
= 54, but a = y(alternate angles)
y = 54o

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