In triangle rst, m∠r > m∠s + m∠t. which must be true of triangle rst? check all that apply.

m∠r > 90°
m∠s + m∠t < 90°
m∠s = m∠t
m∠r > m∠t
m∠r > m∠s
m∠s > m∠t

∠ R 90°

Step-by-step explanation:

Given that in triangle RST

Now as per condition one angle is greater than sum of other two angles.

Since in triangle ,sum of all three angles = 180°

Hence if one angle is  90° then sum of other two must be equal to 90°

And if one angle is 90° then only other two angle be 45° each

Here Let if angle s = angle T = 30° then with this condition angle r is 120° , which is greater than 90°

So, from above it conclude that

For ,

∵ ∠ R = 120°  , then it is greater than 90°

I.e , ∠ R 90°

    Answer

50 min

step-by-step explanation:

they will be decreasing both their times in half

60 / 2 = 30

40/2 = 20

30 + 20 = 50