Answer:

<A = 30⁰ , <B= 60⁰ , <C = 90⁰

Step-by-step explanation:

ratio of angles = 1:2:3

measurements of angles = x,2x,3x

x+2x+3x = 180

6x = 180

x = 180/6 = 30

angles are <A= 30⁰ , <B= 60⁰ , < C = 90⁰

Another method

ratio = 1:2:3

sum of 3 angles = 180⁰

< A = 1/6 × 180 = 30⁰

< B = 2/6 ×180 = 60⁰

<C = 3/6 ×180 = 90⁰