За яких умов △ABC ∼ △MNK:
1) $AB = MN = 40$ см, $BC = NK = 25$ см;
2) $∠A = ∠M, \frac{AB}{MN}\ =\ \frac{AC}{MK};$
3) $∠A = 90°, ∠B = 50°, $
$∠M = 90°, ∠N = 30°?$
4) $∠C = ∠K, CB = 6, CA = 4, $
$KN = 3, KM = 2?$
Розв'язок:
1) $AB = MN = 40$ см, $BC = NK = 25$ см;
2) $∠A = ∠M, \frac{AB}{MN}\ =\ \frac{AC}{MK};$
3) $∠A = 90°, ∠B = 50°, $
$∠M = 90°, ∠N = 30°?$
4) $∠C = ∠K, CB = 6, CA = 4, $
$KN = 3, KM = 2?$