09-10-2021
Mathematics

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the diagram shows a ABCDEF 70× 90cm

the diagram shows a ABCDEF 70 90cm class=

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09-10-2021

Solution :

Tan 25° = C4/BC

=> 0.466 = CF/60

=> C4 = 27.96

A4² = AC² + C4²

AC² = 60² + 40² = 5200

CF² = 781.76

4F² = 5200 + 781.76

=> AF² =5981.76

=> A4 = 77.3

length A4 = 77.3 cm

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