UK 4 hal 195 no 3-5 3. Panjang sisi miring suatu segitiga siku-siku adalah 26 cm dan panjang salah satu sisi siku nya 10 cm tentukan A.panjang jari-jari lingkar

3.
t = √26² - 10²
t = √676 - 100
t = √576
t = 24

S = 1/2 K
S = 1/2 (26 + 24 + 10)
S = 1/2 (60)
S = 30

L = a x t / 2
L = 10 x 24 / 2
L = 10 x 12
L = 120

a.
r = L / S
r = 120 / 30
r = 4

b.
r = a . b . c / 4L
r = 26 . 24 . 10 / 4(120)
r = 6240 / 480
r = 13


5.

S = 1/2 K
S = 1/2 (8 + 15 + 17)
S = 1/2 (40)
S = 20

L = a x t / 2
L = 8 x 15 / 2
L = 4 x 15
L = 60

a.
r = L / S
r = 60 / 20
r = 3

b.
r = a . b . c / 4L
r = 8 x 15 x 17 / 4 (60)
r = 2040 / 240
r = 8,5