Answer:
This is answer for finding bottom right hand corner angle where 25cm total base length is given. Where given, 4cm height trapezium with central height and central right angle, same format question but different heights as seen here in answer.
Step-by-step explanation:
AD part length 1 = 8.5² - 4² = √56.25 = 7.5cm
AD part length 2= 25-7.5 = 17.5cm
AD part length 3= 17.5- 5 = 12.5
AD total length = 7.5+ 12.5 + 5 = 25cm
Area = 1/2 x12.5 x 4 = 25
Scalene Triangle 4/12.5 = 0.3 × 4 = 1.2
CD length size = 12.5 ² + 4² = 156.25 + 16 √172.25 = c² = 13.12cm
13.2/12.5 = 1.056
1/2 12.5 = 6.25
1/2 13.12 = 6.51.
6.25+ 6.51 + 4 = 16.76
1.056 x 16.8
CDA angle = 17.7˚
