an aeroplane flies due north from ikeja airport for 500 km eat dead flies on a bearing of 0-60 degree for for the distance of 300 km before overflying a road junction calculate a the distance of the aeroplane from ikeja airport when it was directly above the junction the road junction be the bearing of the aeroplane from ikeja airport at this distance​

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle

Dwould be the answer

It should be a or d i’m not sure