Anonim A

02 Januari 2024 11:37

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Anonim A

02 Januari 2024 11:37

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Wenny A

02 Januari 2024 13:39

Jawaban terverifikasi

a = 28-7-7 = 14 cm b = 28 cm t = 14 cm d = 14 cm r = 1/2 × d = 1/2 × 14 = 7 cm luas bangun = luas trapesium - luas 1/2 lingkaran = ( 1/2 × ( a+b) × t ) - ( 1/2 × π × r × r ) = ( 1/2 × ( 14+28 ) × 14 ) - ( 1/2 × 22/7 × 7 × 7 ) = ( 1/2 × 42 × 14 ) - ( 1/2 × 22/7 × 7 × 7 ) = 294 - 77 = 217 cm² semoga membantu yaaa 😉


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Sumber W

Community

03 Januari 2024 01:33

Jawaban terverifikasi

<p>Jawaban yang tepat adalah A. 217 cm<sup>2</sup></p><p>&nbsp;</p><p>Pembahasan :</p><p>Luas bangun = Luas trapesium - Luas 1/2 lingkaran</p><p>Luas trapesium = [(jumlah sisi sejajar) x tinggi]/2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= [(14 + 28) x 14]/2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= [42 x 14]/2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 294 cm<sup>2</sup></p><p>Lingkaran</p><p>d = 14 cm</p><p>r = 14/2 = 7 cm</p><p>𝞹 = 22/7</p><p>Luas ½ lingkaran = ½ x 𝞹 x r<sup>2</sup></p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = ½ x 22/7 x 7 x 7</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 77 cm<sup>2</sup></p><p>&nbsp;</p><p>Luas bangun = Luas trapesium - Luas 1/2 lingkaran</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 294 - 77</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 217 cm<sup>2</sup></p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</p><p>&nbsp;</p>

Jawaban yang tepat adalah A. 217 cm2

 

Pembahasan :

Luas bangun = Luas trapesium - Luas 1/2 lingkaran

Luas trapesium = [(jumlah sisi sejajar) x tinggi]/2

                                 = [(14 + 28) x 14]/2

                                 = [42 x 14]/2

                                 = 294 cm2

Lingkaran

d = 14 cm

r = 14/2 = 7 cm

𝞹 = 22/7

Luas ½ lingkaran = ½ x 𝞹 x r2

                                    = ½ x 22/7 x 7 x 7

                                    = 77 cm2

 

Luas bangun = Luas trapesium - Luas 1/2 lingkaran

                            = 294 - 77

                            = 217 cm2

                      

 


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