Question

va rog rpd,nu raspundeti daca nu stiti.1.Calculeaza aria triunghiului:a)a=12cm;ha=7cmb)b=16mm;hb=32mmc)c=0,3m;hc=2,6m.2.Calculati perimetrul triunghiului:a)a=6cm;b=3cm;c=10cmb)a=8,2mm;b=4,5mm;c=13,7mmc)a=6,8km;b=3100m;c=211m

Answer 1

Răspuns:

1.A = baza * inaltimea / 2

a. A = 12 * 7 / 2 = 6*7 = 42 cm cubi

b. A = 16 * 32 / 2 = 16 * 16 = 269 mm cubi

c. A = 0.3 * 2.6 / 2 = 0.3 * 1.3 = 0.39 m cubi

(cm cubi se noteaza cm la puterea 3)

2. P = a + b + c

a. P = 6+3+10 = 19cm

b. P = 8.2 + 4.5 + 13. 7 = 26.4 mm

c.

6.8 km = 6800 m

P = 6800 + 3100 + 211 = 10111 m