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Jawaban:

1)64°50'

=64°+0,5('→°)

=64°+0,5°

=64,5°{A}

2) 18° 21' 5"

8° 43' 7"

——— –

10° (-22') (-2")

=9° (60-22') (-2")

=9° 38' (-2")

=9° 37' (60-2")

=9° 37' 58"{B}

3)<AOB+<BOC+<COD=180°

(x-5)°+90°+(3x-1)° =180°

4x-6 =180°-90°

4x =90°-6

x =84°/4

x =21°

<AOC=<AOB+<BOC

=(x-5)°+90°

=(21-5)°+90°

=16°+90°

=106°{gaada di opsi jawaban}

Maaf kalau salah, semoga membantu