1997 - WAEC Mathematics Past Questions and Answers - page 3
Which of the following statements is/are true when two straight lines intersect?
I. Adjacent angles are equal II. Vertically opposite angles are equal III. Adjacent angles are supplementary
From the diagram above, which of the following is true?
From the diagram, the angles in the triangle are:
(180 - a)°, (180 - b)° and x°.
\(\therefore\) (180 - a) + (180 - b) + x = 180°
360 + x - a - b = 180°
360 - 180 + x = a + b
180 + x = a + b.
Users' Answers & CommentsSum of the angle of a pentagon
= (2 x 5 - 4) x 90
= 540o
126 + 114 + y + 92 + 83 = 540
y = 540 - 415 = 125o
Divide 3.6721 by 4
Find the value of t for which \(\frac{64}{27} = (\frac{3}{4})^{t - 1}\)
\(\frac{64}{27} = (\frac{3}{4})^{t-1}\)
\((\frac{3}{4})^t = \frac{64}{27} \times \frac{3}{4} = \frac{16}{9}\)
\((\frac{3}{4})^t = (\frac{9}{16})^{-1}\)
\((\frac{3}{4})^t = (\frac{3}{4})^{-2}\)
t = -2
Users' Answers & CommentsTQR = 90 - 42 = 48o
QRT = 180 - (64 - 48)
= 180 - 112
= 68o