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itspriusse

  • 4 years ago

Find x. A)4 B)6.7 C)7.2 D)9

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  1. itspriusse
    • 4 years ago
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  2. itspriusse
    • 4 years ago
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    @Walleye can you help me ?

  3. Walleye
    • 4 years ago
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    im trying but I cant seem to think of how to get the answer

  4. Walleye
    • 4 years ago
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    my brain is farting

  5. itspriusse
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    @taewony can you help me ?

  6. asnaseer
    • 4 years ago
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    |dw:1323558134983:dw| ABCD is a cyclic quadrilateral, so:\[ \begin{align} \angle BCD+\angle BAD&=180^0\\ \text{but }\angle BAP+\angle BAD&=180^0\\ \therefore \angle BAP&=\angle BCD&=\alpha\\ \text{similarly, we can show:}\\ \angle ABP &= \angle ADC&=\beta\\ \text{now, using the sine rule we get:}\\ \text{in }\triangle PAB\frac{3}{\sin(\alpha)}&=\frac{4}{\sin(\beta)}\tag{1}\\ \text{in }\triangle PDC\frac{5+4}{\sin(\alpha)}&=\frac{3+x}{\sin(\beta)}\tag{2}\\ \text{dividing (1) by (2) we get:}\\ \frac{3}{5+4}=\frac{4}{3+x}\\ \therefore 9+3x=36\\ \therefore 3x=27\\ \therefore x=9 \end{align}\]

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