Livia's answer to Ñøõđłęś's Secondary 2 Maths Singapore question.
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How to solve it is to find the other two angles(CDB and DBC) of the isosceles triangle. When you find the value of CBD, you can find the value of DBA by taking 90°-70° to find 20°. You can do so as ABC is also a right angle so it has a value of 90°. Therefore, you can take 180°-90°(from DAB) - 20° to get 70° which is the value of ADB. That's all!
Date Posted:
2 years ago
Thanks, the part B. Show CX=15.4 cm. How to solved
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