Explanation

In geometry, the area enclosed by a circle of radius r is πr2

Arear of the circle: πR2

The perimeter of the circle: C = 2πR

Symmetry group: O(2)‎

Explanation

Jean Piaget identified four cognitive development stages:

1. Sensorimotor
2. Preoperational
3. Concrete operational
4. Formal operational

He focused on how children's thinking evolves with age and experience.

Explanation

A blackboard is seen, not heard, so it is a visual teaching aid.

It helps in illustrating and explaining concepts visually to students.

Explanation

The sentence with correct punctuation usage is:

C) The concert was amazing - I've never heard such talented musicians.

Here's a breakdown of why the other options are incorrect:

• A: Commas should be used to separate items in a list. The correct punctuation would be: "My favorite hobbies include reading, knitting, and cooking."
• B: The comma after "outside" is unnecessary. The correct punctuation would be: "It's raining outside; however, I brought my umbrella."
• D: The semicolon is used incorrectly. A comma would be more appropriate: "The professor's lecture was long, but it was informative."

Explanation

"She embarked upon a quest to decipher the cryptic symbols etched beneath the ancient artifact, unraveling its hidden secrets."

• Upon is used to indicate the beginning of a journey or quest.
• Beneath refers to the location or position of the cryptic symbols on the artifact.

Explanation

Dr. Fazlur Rahman was a prominent religious scholar

He was known for his work on Islamic philosophy and thought.

He contributed significantly to modern Islamic studies 

Born: 21 September 1919 in Hazara District

Died: 26 July 1988 (aged 68) Chicago, Illinois, United States

Explanation

Gastric juice is acidic in nature so it has a pH of about 1.5 to 3.5

Gastric acid is a digestive fluid formed within the stomach lining.

gastric juices are usually clear in color

It is the first major step in breaking food down into usable substances

HCL is an important component in gastric juice

Explanation

Edited Book   مرتبہ کتاب

متعدد مصنفین کے لکھے ہوئے ابواب والی کتابیں ترمیم شدہ کتابیں کہلاتی ہیں،

ND-21-5-2023

Explanation

Latitude: a geographic coordinate that specifies the north–south position of a point on the Earth's surface. 

Explanation

The U.S. Central Command Commander General Michael E. Kurilla visited Pakistan on a two-day visit from December 14-16.

The visit focused on strengthening military cooperation and discussing regional security issues.