please solve this question asap its urgent with step by step method 18 question
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Answer:this is the correct answer
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16. {5+√5} {5-√5} = a+b × a-b = a² -b²
a=5 b=√5
=5² - √5²
=25- 5
=20
18. ∠aob = 180°
∠aod = 90°
∠boc +∠cod = 90°
2y + 3y = 90°
5y=90°
y = 90÷5 = 18°
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