Question

tentukan luas
pake cara
jwb...... ​

Answer 1

Jawab:

A. 4√6 cm².

B. 1.540 cm².

C. 960 cm².

D. 4.106,66 cm³.

E. 616 cm².

Penjelasan dengan langkah-langkah:

A. s = ½ × Keliling Δ

s = ½ × ( 7 + 5 + 4 )

s = ½ × 16

s = 8

L = √ s. (s-a) (s-b) (s-c)

L = √ 8. (8-7)(8-5)(8-4)

L = √ 8.1.3.4

L = √ 96

L = 4√6 cm².

B. L = 2 x phi x r ( r + t )  

L = 2 x 22/7 x 7 ( 7 + 28 )  

L = 44 x 35  

L = 1.540 cm².

C. segitiga 1 (alas = 16 cm)  

 t1² = sisi miring² - (1/2 x alas)²  

 t1² = (17 cm)² - (1/2 x 16 cm)²  

 t1² = 289 cm² - 64 cm² = 225 cm²  

 t1 =  = 15 cm  

 segitiga 2 (alas = 30 cm)  

 t2² = sisi miring² - (1/2 x alas)²  

 t2² = (17 cm)² - (1/2 x 30 cm)²  

 t2² = 289 cm² - 225 cm² = 64 cm²  

 t2 =  = 8 cm  

 LP = Luas alas + (2 x luas sisi tegak 1) + (2 x luas sisi tegak 2)  

 LP = (p x l) + (2 x 1/2 x lebar x t1) + (2 x 1/2 x panjang x t2)  

 LP = (30 cm x 16 cm) + (2 x 1/2 x 16 cm x 15 cm) + (2 x 1/2 x 30 cm x 8 cm)  

 LP = 480 cm² + 240 cm² + 240 cm²  

 LP = 960 cm².

D. Volume kerucut

=1/3×π×r×r×t

=1/3×22/7×14×14×20

=1/3×12.320 cm³

= 4.106,66 cm³.

E. L = 4πr²

  = 4×22/7×7×7

  = 616 cm².

Maaf kalo salah

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