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atroni [7]
3 years ago
5

Work out size of angle cde​

Mathematics
1 answer:
-Dominant- [34]3 years ago
8 0

Step-by-step explanation:

CDE = 2x, DEF = x

hexagon = 720°

720 = 115 + 145 + 160 + 90 + 2x + x

720 = 3x + 510

720 - 510 = 3x

210 = 3x

x = 210 ÷ 3

x = 70°

CDE = 2x

= 2(70)

= 140°

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In ΔRST, m < R = 104°, r = 20, and t = 10. Find the m < S, to nearest degree.
Mrrafil [7]

9514 1404 393

Answer:

  47°

Step-by-step explanation:

The law of sines helps you find angle T. From there, you can find angle S.

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  T = arcsin(sin(104°)/2) ≈ 29°

Then angle S is ...

  S = 180° -R -T = 180° -104° -29°

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