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keliling setengan lingkaran dengan jari - jari 7cm adalah...cm A. 22 B. 36 C. 28 D. 44 Previous page Next page

keliling setengan lingkaran dengan jari - jari 7 cm 7 \mathrm{~cm} adalah...cm\newlineA. 2222\newlineB. 3636\newlineC. 2828\newlineD. 4444\newlinePrevious page\newlineNext page

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Q. keliling setengan lingkaran dengan jari - jari 7 cm 7 \mathrm{~cm} adalah...cm\newlineA. 2222\newlineB. 3636\newlineC. 2828\newlineD. 4444\newlinePrevious page\newlineNext page
  1. Circle Circumference Formula: The formula for the circumference of a full circle is C=2πrC = 2\pi r, where rr is the radius.
  2. Semicircle Circumference Formula: For a semicircle, the circumference is half of the full circle plus the diameter. So, the formula is (πr)+2r(\pi r) + 2r.
  3. Substitute Radius and Calculate: Substitute r=7r = 7 cm into the formula: (π×7)+(2×7)=7π+14(\pi \times 7) + (2 \times 7) = 7\pi + 14.
  4. Calculate 7π7\pi: Use π≈227\pi \approx \frac{22}{7} to calculate 7π7\pi: 7×(227)=227 \times \left(\frac{22}{7}\right) = 22.

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