Question

pake cara .............​

Answer 1

Verified answer

PEMBAHASAN

Dimensi Tiga

Limas Segi Empat Beraturan

Limas T.ABCD

AB = BC = 10 cm

TA = 18 cm

O tengah AC

TO = tinggi limas

AC = AB√2 = 10√2 cm

AO = OC = 1/2 AC = 5√2 cm

c.

TO ⊥ ABCD

∆AOT siku di O

Jarak T ke bidang ABCD

= tinggi limas

= TO

= √(TA² - AO²)

= √(18² - (5√2)²)

= √(324 - 50)

= √274 cm

≈ 16,6 cm (geogebra)

b.

Perhatikan ∆ACT

X pada AT

CX ⊥ AT

Jarak C ke AT

= AC × TO/AT

= 10√2 × √274 / 18

= 10/9 √137 cm

≈ 13 cm (geogebra)