Question 149Asked in Bihar STET 2025 Paper II Computer Science, 7 Nov 2025, Shift 1 (9:00 AM)

ABCD is a rhombus in which ∠ADB = 25 Degree. Then, the value of ( 2∠BAD - ∠ABC ) isABCD एक समचतुर्भुज है , जिसमें ∠ ADB = 25 डिग्री है। तब , ( 2 ∠ BAD - ∠ ABC ) का मान है:

ABCD is a rhombus in which ∠ADB = 25 Degree. Then, the value of ( 2∠BAD - ∠ABC ) is :
ABCD एक समचतुर्भुज है , जिसमें ∠ ADB = 25 डिग्री है। तब , ( 2 ∠ BAD - ∠ ABC ) का मान है:
  1. A230 Degree230 डिग्री
  2. B240 Degree240 डिग्री
  3. C210 Degree210 डिग्री
  4. D260 Degree260 डिग्री
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Correct answer: (A) 230 Degree230 डिग्री

Explanation

Note: the answer key gives (A), but a diagonal bisects a rhombus's angle, so ∠ADC = 50°, ∠BAD = 130° and ∠ABC = 50°. Then 2 × 130 − 50 = 210° (C).नोट: आधिकारिक उत्तर कुंजी (A) देती है, लेकिन विकर्ण समचतुर्भुज के कोण को समद्विभाजित करता है, इसलिए ∠ADC = 50°, ∠BAD = 130° और ∠ABC = 50°। तब 2 × 130 − 50 = 210° (C)।

From Bihar STET 2025 Paper II Computer Science PYQ, 7 Nov 2025, Shift 1 (9:00 AM)

This is question 149 of Bihar STET 2025 Paper II Computer Science PYQ, 7 Nov 2025, Shift 1 (9:00 AM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.