10-Minute Methods to Develop Growth Mindset for Parents: Deepen Your Relationship with Your Ch

10-Minute Methods to Develop Growth Mindset for Parents: Deepen Your Relationship with Your Ch

Matematika tentukan keliling yang diarsir!
a. 59
b. 69
c. 79
d. 96

tolong beserta caranya!!!
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tentukan keliling yang diarsir!
a. 59
b. 69
c. 79
d. 96

tolong beserta caranya!!!
​

Keliling Daerah yang Diarsir

= (¼ × 2Ο€r) + (¼ × 2Ο€r) + 2 (r2 - r1)

= (½ × 22/7 × 14) + (½ × 22/7 × 21) + 2 (21 - 14)

= (½ × 22 × 2) + (½ × 22 × 3) + 2 (7)

= (11 × 2) + (½ × 66) + 14

= 22 + 33 + 14

= 55 + 14

= 69 cm