Tolong kakk bantuuu!!

Tolong kakk bantuuu!!

Jawaban:

1. – mempunya 2 pasang sisi sejajar sama

panjang

– keempat sudutnya membentuk sudut siku2

– memiliki 2 sumbu simetri

– memiliki 2 simetri lipat dan 2 simetri putar

2. K = 36cm

a = 10 cm

pj. 2 sisi yg lain = (36 – 10) : 2

= 26 : 2

= 13cm

$t = sqrt{ {13}^{2} - {5}^{2} } \ = sqrt{169 - 25} \ = sqrt{144} \ = 12cm$

luas segi3 = 1/2 × alas × tinggi

= 1/2 × 10 × 12

= 5 × 12

= 60cm2

3. Kel = 80 cm

sisi = 80 : 4

= 20cm

d1 = 24cm

1/2 d1 = 24 :2

= 12cm

1/2 d2

$sqrt{ {20}^{2} - {12}^{2} } \ = sqrt{400 - 144 } \ = sqrt{256} \ = 16cm$

maka d2 = 2 × 16

= 32cm

Luas = 1/2 × d1 × d2

= 1/2 × 24 × 32

= 12 × 32

=384cm2

4. kel = 66

AB = AD = 20

2 sisi yg lain = (66 – (20 + 20)) : 2

= (66 – 40) :2

= 26 : 2

= 13cm

d1 = 24, setengahnya = 12cm

$co = sqrt{ {13}^{2} - {12}^{2} } \ = sqrt{169 - 144} \ = sqrt{25} \ = 5cm$

$ao = sqrt{ {20}^{2} - {12}^{2} } \ = sqrt{400 - 144} \ = sqrt{256} \ = 16cm$

d2 = 5cm + 16cm

= 21cm

Luas = 1/2 × d1 × d2

= 1/2 × 24 × 21

= 12 × 21

= 252cm2

5. mencari sisi

$sqrt{ {4}^{2} + {3}^{2} } \ = sqrt{16 + 9} \ = sqrt{25} \ = 5cm$

kel = 4 ×5

= 20cm