Jawaban

Penjelasan dengan langkah-langkah:

1. luas segitiga

1/2 x alas x tinggi

1/2 x 7 x 6

= 1/2 x 42 = 21 cm²

keliling segitiga =

a + b + c

7 + 6 + 13 = 26 cm

2. luas persegi panjang =

p x l

= 6 x 4 = 24 cm²

keliling = 2 . (P + l)

= 2 . ( 6 + 4 ) = 2 . 10 = 20 cm

3. luas persegi =

sisi x sisi

= 12 x 12 = 144 cm²

keliling persegi =

4 x sisi

= 4 x 12 = 48 cm

4. luas jajargenjang =

alas x tinggi

= 7 x 3 = 21

Keliling = 2 x (a+b)

= 2 x ( 7 + 4 )

= 2 x 11 = 22 cm

5. luas layang layang =

d1 x d2 7 x 8 56

———— = ______ = ___ = 28 cm²

2 2 2

Keliling =

2 x ( a + c)

2 x ( 3 + 7 )

2 x 10 = 20 cm

6. luas trapesium =

( a + b x t) ÷ 2

= ( 8 + 6 x 4 ) ÷ 2

= 14 x 4 ÷ 2

= 56 ÷ 2 = 28 cm²

keliling trapesium =

= ab + bc + cd + da

= 8 + 5 + 6 + 5 + 4

= 28 cm

7. luas lingkaran =

π x r²

= 22/7 x 7 x 7 = 154 cm²

keliling =

2 x π x r

2 x 22/7 x 7

= 44 cm

semoga bermanfaat